Describe the bug
Making a POST at any of the 4 URLs with accessor having the supplied value in the JSON examples, results in 500 - Internal Server Error

To Reproduce
Steps to reproduce the behavior:

1. Run curl with the payload supplied in the json files.

Tests.zip

Same steps to reproduce for all paths.

This was discovered while running a fuzzing tool I wrote for OpenAPI specs: https://github.com/Endava/cats. You can replay all the tests using:

./cats.jar replay --tests="Test349.json,Test785.json,Test1163.json"

Expected behavior
A 400 response.

Environment:

• Vault Server Version (retrieve with vault status): 1.9.0
• Vault CLI Version (retrieve with vault version): Vault v1.9.0
• Server Operating System/Architecture: macOS Monterey 12.0.1

Probably same root cause as: #13225